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The model is correct regarding the small farm at grids F2 and G2.
The beam and column_1 bar types must be reconfigured because the buckling lengths are not correct.
Why do you use claddings as there is no load on them?
I suppose that stability in the Y direction is ensured by the concrete structure, so no vertical bracing is necessary.
M. Agayr
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Do not to take into account the masonry structure in the model to avoid problems relating to the steel-masonry junction.
Also pay attention to the masonry on the facades which will transmit wind load, so use cladding. Use vertical bracings, because the masonry will not transmit efforts due to poor steel-masonry connections.
Apply the loads directly to these claddings instead of applying them to the bars.
Use a different bar type for each kind of column and beam. example, for main frame columns you’ll use
We are far from the use of Robot, but rather on steel structure design.
M. Agayr
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This option is not available with ARSA 2019
Of course it exists
1- How can this column support the smaller frame?
Yes it can, as soon as the 2 members are connected
2- Or should I use two columns (with perpendicular orientations) rather than one column?
Not necessary, but if you want you can use a compound member column
3- Or should I use rigid links with one column (on grid F2) to transfer the loads from the smaller frame using bracket? Or should I extend bar 159 to the column on grid F2?
No
What about my concerns in OP
What do you mean by OP
M. Agayr
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This is displayed with my office ARSA:
Your option in step #4 doesn't appear here.
Yes it can, as soon as the 2 members are connected
As you can see in my model, I used compound member column W8x48 S8x23 on grid F2 and G2. How can S8x23 support the smaller frame while W8x48 would support the main frame. This was my intent.
Not necessary, but if you want you can use a compound member column
It seems you didn't notice I already used compound member column in my model at grid F2 and G2.
What do you mean by OP
OP: original post
Your option in step #4 doesn't appear here.
Try again and click on step3 then 4
As you can see in my model, I used compound member column W8x48 S8x23 on grid F2 and G2. How can S8x23 support the smaller frame while W8x48 would support the main frame. This was my intent.
The compound member will act as a single column and and will support both members.
M. Agayr
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I followed all steps as seen in the screenshots, but without success.
It's weird!
In practice S8x23 (supporting the smaller frame) will be shorter than W8x48 (supporting the main frame). Please have a look at my model. How one can consider this in modeling?
As i said before, compound column will act as a single member #26.
Upper frame will be supported at node #32 and lower one at node #128
M. Agayr
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If so, I wouldn't use compound column. I would use W8x48 only.
This is not a good idea, because the flange of S28x23 will be used to connect the lower frame, otherwise how will you connect the lower frame to the W8x48 web
Look at this video to create a member type
M. Agayr
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Did you mean that ARSA would use S28x23 only to connect the lower frame?
Please look at the image below for the 2 options with an without S28x23 and choose what option you prefer. Keep in mind that compound bar will provide more stiffness to both frames and better connetion design:
Please try on your computer to display the same Buckling Diagrams dialog that I uploaded in message 7. If you could do it, then it seems I'm not following your steps from 1 to 4 in message
Please follow steps in my video
M. Agayr
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S28x23 web should be connected to W8x48 flange and not the way you showed in compound option, so the rafters of the smaller frame would be bearing on S28x23 and the rafter of the main frame would be bearing on W8x48 and the smaller frame would be outside the main frame.
That's not what is in your model
Why you don't follow my post:
It's difficult to follow, please circle in red the steps you have followed
M. Agayr
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Sorry my mistake. The compound section should be S10x25.4 W8x48. S10x25.4 web should be connected to W8x48 flange, so the rafters of the smaller frame would be bearing on S10x25.4 and the rafter of the main frame would be bearing on W8x48 and the smaller frame would be outside the main frame.
I admit that it is difficult to follow you. Could you do a hand sketch
Please try on your computer to display the same Buckling Diagrams dialog that I uploaded in message 7. If you could do it, then it seems I'm not following your steps from 1 to 4 in message.
I am on Robot 2024, indeed we don't have the same figures. You may click on 2
M. Agayr
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